It's a TD5 with standard engine. I've been told about a pressure test but apparently they work better on petrol than diesel engines? Also been told that even replacing the HG may not solve problem (build up of excessive pressure resulting in loss of coolant) and could then be looking at poss...

I'm new to this site and the whole idea of DIY mechanics. But with a poorly Disco II I'm in desperate need of guidance. Car started over heating and losing water - AA man said probably thermostat. Replaced that and no real difference so probably head gasket. Referred to guy who good with...